Biology · Science General

Diversity in Living Organisms

3,323 Questions

The diversity in living organisms deals with the classification of life forms into various kingdoms and phyla. This topic covers specific traits of bacteria, animal body cavities, and structural adaptations for survival. These fundamentals are crucial for biology sections in medical entrance and state board exams.

Animal phyla characteristicsBacteria and flagellaBiological adaptationsKingdom Animalia classificationBody cavity typesExtinct organism subphylaJawless animals identification

Diversity in Living Organisms Questions

Multiple choice

Which of the following correctly differentiates a prokaryotic cell from a eukaryotic cell?

  1. Prokaryotic cells do not perform photosynthesis but eukaryotic cells perform photosynthesis.

  2. Prokaryotic organisms lack cytoplasm but eukaryotic organisms possess cytoplasm.

  3. Nuclear membrane is absent in prokaryotes but it is present in eukaryotic organisms.

  4. Prokaryotes have a well defined nuclear region but eukaryotes possess nucleoid that contains only nucleic acid.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nuclear membrane is absent in prokaryotes as they do not have a well developed nucleus and the nuclear material is said to be nucleiod. But, eukaryotes possess a well-defined nuclear membrane around the nucleus of the cell.

Multiple choice

Which of the following are not found in hydra?

  1. Epitheliomuscular cells

  2. Cnidocytes

  3. Choanocytes

  4. Nerve cells

  5. -
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

These are flagellated cells with a collar of protoplasm at the base of the flagellum, numbers of which line the internal chambers of sponges. These are not found in hydra.

Multiple choice

Body cavity of adult Ascaris is

  1. haemocoel

  2. amphocoel

  3. pseudocoel

  4. schizocoel

  5. -
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A body cavity (as in various worms) that is not the product of gastrulation and is not lined with a well-defined mesodermal membrane is pseudocoel.

Multiple choice

Which of the following types of symmetry is found in adult sea anemone?

  1. Radial

  2. Symmetrical

  3. Biradial

  4. Bilateral

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Radial symmetry is especially suitable for sessile animals, such as the sea anemone. It is the symmetrical arrangement of parts of an organism around a single main axis so that the organism can be divided into similar halves by any plane that contains the main axis.

Multiple choice

Pseudocoelom is the characteristic of which of the following?

  1. Annelida

  2. Mollusca

  3. Echinodermata

  4. Nematoda
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pseudocoelom is a fluid-filled body cavity that lies inside the external body wall of the nematode that bathes all the internal organs, including the alimentary system and the reproductive system.

Multiple choice

Hydra has which of the following?

  1. One testis and one ovary

  2. One testis and many ovaries

  3. Many testes and many ovaries

  4. Many testes and one ovary
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Usually, several testes develop on the anterior half of the column and usually one ovary develops on the posterior half of the column.

Multiple choice

Larva of Sycon is

  1. parenchymula

  2. amphiblastula

  3. redia

  4. trochophore
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Amphiblastula larva is the larva of Sycon, which is a poriferan.

Multiple choice

Choanocyte is the characteristic feature of

  1. sponges

  2. arthropods

  3. annelida

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

These are flagellated cells with a collar of protoplasm at the base of the flagellum, number of which line the internal chambers of sponges.

Multiple choice

Bacteria do not have

  1. ribosomes

  2. protein synthesising apparatus

  3. mitochondria

  4. cell wall

  5. -
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bacteria, being prokaryotic, lack mitochondria.

Multiple choice

Amoeba is a/an

  1. unicellular animal

  2. octacellular animal

  3. multicellular animal

  4. All of the above

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Amoeba is a unicellular animal having one cell. It performs all the functions through it.

Multiple choice

Which of the following is the largest phylum in terms of number of species?

  1. Coelenterata

  2. Porifera

  3. Arthropoda

  4. Protozoa

  5. -
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Arthropoda is the largest phylum in the animal kingdom, which includes familiar forms as lobsters, crabs, spiders, mites, insects, centipedes and millipedes. About 84 percent of all known species of animals are members of this phylum.